A staff member monitors new energy power supply data at the State Grid Qinghai Electric Power Company in Xining, northwest China's Qinghai Province, June 20, 2018. Northwest China's Qinghai Province on Wednesday initiated a nine-day clean energy power supply project following a successful seven-day trial last year. The province plans to only use green energy sources to generate electricity from June 20 to 28 to promote the use of clean energy. (Xinhua/Zhang Hongxiang)